View clinical trials related to Diabetic Retinopathy.
Filter by:Panretinal photocoagulation (PRP) has been the standard treatment for Proliferative diabetic retinopathy (PDR) since the Diabetic Retinopathy Study demonstrated its benefit nearly 40 years ago,but PRP has inevitable adverse effects on visual function. Intravitreal injection of vascular endothelial growth factor(VEGF) can induce short-term regression of retinal neovascularization(NV). The purpose is to assess and compare the efficacy and safety between intravitreal injection of conbercept and PRP.
Type 2 Diabetes (TD2) is the leading cause of new cases of preventable blindness in these countries (and the gold-standard treatment, laser photocoagulation has proven to be effective in preventing vision loss at the end stage of eye disease due to proliferative diabetic retinopathy (PDR) that occurs in 3 to 6 % of the cases.Therefore, the ongoing search for predictive factors of sight threatening stages of diabetic retinopathy has become more important. Previous studies that have examined candidate predictive factors for diabetic eye disease have mostly focused on systemic risk factors leading to PDR. Among various clinical parameters, increased HbA1c % levels, uncontrolled blood pressure, diabetes duration, neuropathy and elevated triglycerides have been associated with PDR. Some genetic factors may also account for the development of PDR and are prospectively considered in this study .
The contribution of OCT- angiography (OCT-A) allows to consider, in a more or less long term, a drastic reduction in the use of fluorescein angiographies in diabetic retinopathy. The accuracy of the analysis of the vascularization of retinal layers of the posterior pole of the eye by the OCT-A , will detect, early and in a quantifiable manner, whether or not there are areas of macular ischemia in a patient. However, current technical limitations (small field analysis) of OCT-A imaging only allow a limited study of retina at the posterior pole of the fundus. This study seeks to demonstrate whether there is a link between macular ischemia detected by the OCT-A and peripheral retinal ischemia detected by the fluorescein angiographies, in diabetic patients.
Diabetic retinopathy(DR) is a sight threatening condition that occurs in persons with diabetes. DR arises as a consequence of damage to the retinal blood vessels and is related to the high and fluctuating sugar levels in the blood stream. An eye with DR will have abnormal appearing retinal blood vessels which become engorged and dilated, leaky and fragile or undergo closure. The net result is a picture of haemorrhage and or ischaemia (lack of blood supply). A particular feature of DR is the accumulation of fluid in the macula which is the central part of the retina and responsible for detailed eye sight. This peculiar form of DR is called Diabetic Macular Oedema (DMO). DMO can occur in isolation without other features of DR. DMO is commoner in type 2 diabetes where insulin resistance and abnormalities of blood fats are found. The investigators wish to study DR and DMO using high resolution retinal imaging and functional tests in normal participants, those participants with diabetes without any overt signs of disease and those with DR and DMO in order to understand how the condition develops and whether there are any unique risk factors that can be identified
In this study, markers of oxidative stress will be measured in the aqueous humour of stargardt disease, age related macular degeneration and diabetic retinopathy patients compared to controls.
Objectives: Main objective: To compare the percentage of patients with new microaneurysm or hard exudates after 12 months between the CPAP group and the control group. Secondary objectives: To compare the central macula volume, ganglion cell layer thickness and central fovea thickness at baseline and 12, 24 and 52 weeks after randomization between the two study groups; to compare the percentage of patients who have an improvement loss of visual acuity (more than or equal to 15 letters in patients with macular edema and more than or equal to five letters in patients without macular edema) among the baseline visit and the weeks 12, 24 and 52 between the two study groups; to compare the percentage of patients who reach a higher level of diabetic retinopathy at 54 weeks between the two study groups; to compare the resolution time of central macula thickness from the randomization between the two study groups; to compare the glycated hemoglobin at baseline and 12, 24 and 52 weeks after randomization between the two study groups; and to compare the serum levels of inflammatory cytokines, oxidative stress biomarkers, sympathetic tone, and intake regulator hormones at baseline and 12 and 52 weeks after randomization between the two study groups. Methodology: Randomized, multicenter, non-blinded, parallel groups, conventional treatment-controlled trial of 12 months of duration. Subjects will randomize to conventional dietary and pharmacological treatment or conventional dietary and pharmacological treatment plus continuous positive airway pressure (CPAP). Study subjects: Subjects 35 to 75 years with type 2 diabetes and a clinical diagnosis of mild diabetic retinopathy (with or without macular edema), better visual acuity from 20/40 to 20/320 letters and refraction with a spherical equivalent less than ± 5 diopter. Efficacy variables: Thickness of the central sub-field, central subfield volume, ganglion cell layer thickness, and presence of clinical or subclinical macular edema, serous retinal or retinal pigment epithelium detachment, intraretinal cysts or haemorrhages assessed by optical coherence tomography; presence of cotton exudates, microhemorrhages, microaneurysms, , microvascular retinal abnormalities, or a vein/artery ratio > 2/1 in examination of ocular fundus/retinography; better corrected visual acuity; glycosylated hemoglobin (HbA1c); fasting glucose and insulin; homeostatic model assessment (HOMA) and QUICKI indices; lipid profile, troponin I, proBNP, homocysteine and C-reactive protein; systemic biomarkers of inflammation, oxidative stress, endothelial damage, sympathetic activity and appetite-regulating hormones and clinical questionnaires: short form (SF)-12, visual function questionnaire (VFQ25) and iPAQ.
The CLEAR study is testing the level of agreement between visual acuity and Amsler grid testing using a mobile vision testing application, Checkup Study, and standard in office methods. In addition the percent of patients able to successfully complete home testing on the digital device will be assessed.
Introduction: Diabetic mellitus (DM) is a prevalent disease in Hong Kong (HK) and diabetic retinopathy (DR) is one of the most common complications of DM. Screening for DR is a cost-effective method to identify patients who are at risk of vision loss so that timely treatment can be provided to patients. In Hong Kong, the Hospital Authority has recently set up screening services (RAMP) in the government outpatient clinics and all DM patients attending these clinics will be screened at least once every two years and some every six months, according to their individual risks. However, those diabetic patients who attend the private sector for their primary care may not have access to this service. Aim: This study from the University of Hong Kong aims to determine the characteristics of a sustainable approach to setting up an effective and quality-controlled screening service for DR in the private primary care sector of Hong Kong and to estimate the potential benefit to be gained in terms of impact on avoidable vision loss, costs of care and potential for further development of this model in chronic disease care. Methods:A screening centre is being set up and a randomised study carried out in which screening will be offered at three different fee levels to subjects recruited by their general practitioner (GP). The following data will be collected (a) willingness to attend screening at the different fee levels (b) screening findings in terms of DR and other eye diseases (c) risk factors and other characteristics of those screened and unscreened. The information will allow us to estimate the level of fee which best combines effectiveness with sustainability in the longer term.
The RECOVERY trial will assess the safety and tolerability of 2 mg intravitreal aflibercept injections (IAI) given monthly (Q4WK) or every 12 weeks (Q12WK) for the treatment of retinal capillary non-perfusion (RNP) associated with proliferative diabetic retinopathy (PDR). - Assess the safety and tolerability of IAI for the treatment of proliferative diabetic retinopathy by evaluating the incidence and severity of ocular and systemic adverse events through week 52 - Change in area of retinal capillary non-perfusion, as assessed by central reading center, from baseline through week 52
Although vitreous hemorrhage (VH) from proliferative diabetic retinopathy (PDR) can cause acute and dramatic vision loss for patients with diabetes, there is no current, evidence-based clinical guidance as to what treatment method is most likely to provide the best visual outcomes once intervention is desired. Intravitreous anti-vascular endothelial growth factor (anti-VEGF) therapy alone or vitrectomy combined with intraoperative PRP each provide the opportunity to stabilize or regress retinal neovascularization. However, clinical trials are lacking to elucidate the relative time frame of visual recovery or final visual outcome in prompt vitrectomy compared with initial anti-VEGF treatment. The Diabetic Retinopathy Clinical Research Network Protocol N demonstrated short-term trends consistent with a possible beneficial effect of anti-VEGF treatment in eyes with VH from PDR, including greater visual acuity improvement and reduced rates of recurrent VH as compared with saline injection. It is possible that a study with a longer duration of follow-up with structured anti-VEGF retreatment would demonstrate even greater effectiveness of anti-VEGF for VH to avoid vitrectomy and its attendant adverse events while also improving visual acuity. On the other hand, advances in surgical techniques leading to faster operative times, quicker patient recovery, and reduced complication rates may make prompt vitrectomy a more attractive alternative since it results in the immediate ability to clear hemorrhage and to perform PRP if desired, often as part of one procedure. This proposed study will evaluate the safety and efficacy of two treatment approaches for eyes with VH from PDR: prompt vitrectomy + PRP and intravitreous aflibercept injections.